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Rock Art can be “interpreted” in many ways, including by modern artists and spiritual practitioners with purposes which may have either a lot or very little to do with the reasons it was produced long ago.These modern interpretations can be useful to those who engage in them, even giving great pleasure and serenity.But there are difficulties with each step in collecting this kind of evidence.Petroglyphs are made by removing the outer dark surface of rocks, called rock varnish or patina, to reveal the lighter rock underneath.On these particular pages of our web site, we are concerned with the meaning of Rock Art to its creators and audiences of the past, not to people of the present.

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Rocks exposed in Grand Canyon are truly ancient, ranging from 1840 million years old (m.y.), or 1.84 billion years old (b.y.), to 270 m.y.For each dating or chronological method there is a link in the box at right to take you to that section of this page.There, you will find a brief description of the method, plus links to take you to other webpages with more extensive information.We then describe Grand Canyon rocks as belonging to three “sets,” or packages of rocks, each with unique geologic histories, and present a compilation of “best” numeric ages for Grand Canyon rocks to use when explaining Grand Canyon geology to the public.Photo 1: Many people consider Grand Canyon National Park the world’s premiere geologic landscape and a “geologic wonder”.

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Today we have a test quiz in which each answer of those 10 questions, it will be interpreted ...